1954523 - YouTube HDR video is way too bright on external monitor (KTC H27T27)

Status: UNCONFIRMED

(Core :: Graphics, defect)

Description

[Kagami Rosylight 🏳️‍🌈🏳️‍⚧️ [:saschanaz] (they/them)]

(Reposting a user report here)

0. On Firefox 137.0b5 / macOS 15.4 Beta, with MacBook Pro (M1 Pro, 14"), with KTC H27T27 external monitor:
1. Open https://youtu.be/72A2Rf-V6oE
2. See if it looks right (compare it to the following attachments)

I could not confirm this because somehow YouTube rejects to send HDR video on my Dell monitor (bug 1954516).

Comment 1

[Kagami Rosylight 🏳️‍🌈🏳️‍⚧️ [:saschanaz] (they/them)]

Attachment: The video on Safari, just as bright as expected

Comment 2

[Kagami Rosylight 🏳️‍🌈🏳️‍⚧️ [:saschanaz] (they/them)]

Attachment: The video on Firefox, too bright that almost everything looks white

Comment 3

[Timothy Nikkel (:tnikkel)]

Sounds a lot like bug 1952603.

Comment 4

[BugBot [:suhaib / :marco]]

The severity field is not set for this bug.
:bhood, could you have a look please?

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